Windows
One installer. It puts `epher` on your PATH. Use it from CMD, PowerShell, the Start menu, or a double-click.
Downloads
epher a scriptable, graphing calculator
One calculation engine, five ways to use it: command line, interactive REPL, full TUI interface, desktop GUI app, and an offline web app. Type expressions, save functions and scripts, graph results in 2D or 3D, and keep history between sessions and user interfaces. No account, no cloud: your work stays on your device. Available as native apps for Windows, macOS, Linux, and in the browser.
graph3d x ^ 2 - y ^ 2
try thisWhy epher
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A real language
Variables, functions with recursion, loops, and scripts you can save or load. Newlines and `;` separate statements; both mean the same thing.
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Exact when it matters
Binary floats by default, with exact layers one call away: frac(1, 3), dec(0.1) + dec(0.2), and big(10 ^ 20).
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Graphs in 2D and 3D
Plot curves and surfaces, trace points, animate any constant with a play button, and orbit 3D views with touch or keyboard.
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Private by design
No accounts, no telemetry, no cloud. Everything is computed and stored on your device. The web app executes on your own device, fully offline.
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One download, five frontends
The same epher program runs as a one-shot command, a REPL, a full-screen terminal UI, and a desktop app. Learn it once, use it anywhere.
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Multi-language support
The interface ships in eight languages: English, Chinese, Hindi, Spanish, French, German, Portuguese and Arabic, with right-to-left support.
Get epher
One download, every way to use epher: the command line, a REPL, terminal UI app, a desktop app and an isolated offline web app.
macOS
One app. Drag it to Applications; a button inside installs the `epher` terminal command for you. First launch: right-click the app and choose Open.
Downloads
Linux
One install per package family: Debian/Ubuntu, Fedora/RHEL, or the AppImage for everything else (Arch included). All put `epher` on your PATH.
- Add our repository, then install:
curl -fsSL https://epher.org/apt/KEY.gpg | sudo tee /etc/apt/keyrings/epher.gpg >/dev/null curl -fsSL https://epher.org/epher.sources | sudo tee /etc/apt/sources.list.d/epher.sources >/dev/null sudo apt update && sudo apt install epher
- Add our repository, then install:
curl -fsSL https://epher.org/epher.repo | sudo tee /etc/yum.repos.d/epher.repo >/dev/null sudo dnf install epher
Web app
Runs in your browser, is installable, and works fully offline after the first visit.
Get it
Works fully offline once loaded. Install it from your browser's menu.